Rotary bit



QcLZl, 1 952 c. c. GOOLSBEE ,6 ,8 ROTARY BIT Filed June 16, 1947 5Sheets-Sheet 2 (IZARZH'C GOOLSBHE" INVENTOR B) y 5 g A TTORNEYIS Oct.21, 1952 c. c. GOOLSBEE 5 3 ROTARY BIT Filed June 16, 1947 v asneets-smaet :5

ATTORNEYS Oct. 21, 1952 c. c. GOOLSBEE v ROTARY BIT Filed June 16, 19475 Sheets-Sheet 4 i9; 4 ZIARLH a 600M559 DWFNTOR B if 6M ATTORNEYS' Oct.21, 1952 c. c. GOOLSBEE 2,614,810

ROTARY BIT Filed June 16, 1947 5 Sheets-Sheet 5 (HARLEY (f GOOLJ'BEEINVFNT 012 AT T ORA UL Patented Oct. 21, 1952 ROTARY BIT Charles C.Goolsbee, Houston, Tex., assignor to Reed RollerBit Company, Houston,Tex a corporation of Texas Application June 16, 1947, Serial No. 754,922

7 Claims.

This invention relates to improvements in rotary bits and refers moreparticularly to a bit that may be economically fabricated, and thefabrication of which requires a minimum of machine work, the bit beingmade up of two pairs of segmental parts, one pair of which may be usedeither in drag-type bits or bits having in combination both drag androller type cutters.

In the interest of economical fabrication of bits and parts thereof, itis desirable when possible to have a standardization of parts going intodifferent types of bits. It is also desirable to use forgings or thelike for the parts of the bits and to form the parts in such manner thaton assembly into a bit a minimum of machine or other? tool work isrequired.

An object of this invention is to provide a rugged bit made up ofsegments individually formed and requiring a minimum of machine or otherspecial tool work.

Another object is to provide a rugged bit made up of segmentsindividually formed and requiring a minimum of machine or other specialtool work which, when made up has flush passages for drilling fluidformed therein without the re-L'i. Q quirement of drilling or otherspecial tool work.

A further object is to provide a bit segment having an integral dragblade, the segment being useable alternatively in making up drag bits orbits with combination drag and roller cutters.

Another object is to provide a bit segment having an integral dragblade, the segment being useable alternatively in making up either dragbits or bits with combination drag and roller cutters,

wherein on. assembly flush passages for directing? drilling fluid on thedrag blades are formed without requirement of drilling or other specialwork.

Other and further objects of thisinvention will appear from thefollowing description:

In the accompanying drawings which form aw in Fig. 1;

Fig. 3 is a side-elevational view of the bit segments of Fig. 2 shown inassembled relation;

Fig. 4 is a view taken along the line 4-4 in Fig. 3 in the direction ofthe arrows;

Fig. 5 is a bottom plan view of the assembly shown in Figs. 3 and 4; and

Fig. 6 is a side-elevational view of a bit. i l

Referring to the drawings, it is believed that the invention can be morereadily understood by first having reference to the Figs. 2 to 5inclusive, illustrating one pair of the segmental parts which go intothe construction, and form component parts of the assembled bitsillustrated in Figs. 1 and 6. It should be borne in mind that theassembled bits of both figures of the drawings'are made up of two pairsof bit segments, one pair of which may beused alternatively in making upeither of the bitsinFigssI and fip Thispair of segments is shown inexploded position in Fig. 2

modified and illustrates the contour of both sides'of the segment.

The bit segment has a portion I0 which makes up a part of the pin l I ofthe assembled bit, and has another portion l2 which provides a dragtypecutter blade I3. The segment, of course, is one integral piece andpreferably is a forging.

In order to provide a passage for directing drilling fluid over theblade cutters 13 in operation, each of the cutter segments are formedwith a part which on assembly of the bit cooperates holes in either thesegment or bit body. This step ter blades may be used in a bit of thetypeihaving both drag blades and roller cutters, the segment is providedwith a portion i ii which may be drilled to form a flow passage, asshown at IT. The passage at I! serves to direct drilling fluid upon theroller cutters of the assembled bit and are not drilled unless thesegments are to be employed in a bit having roller cutters.

The pair of bit segments, which areeriiployed in conjunction with thepair of segments shown in Figs. 2 to 5, inclusiva on assembly of the bitprovide the remainder of the pin, except for the welding materialemployed to join the bit segments together as is clearlyshown in Fig.1.In :this figure of the drawings, the part It constitutes one of the pairof segments and is welded to the segments of the other pair as shown atl9.

If a bit is to be made having roller cutters as well as blade cutterssegments 20, as shown in Fig. 6, are employed in lieu of the segmentsl8. These segments have a portion forming a part of the bit pin. Anotherportion 2| integral therewith constitutes a roller cuttersupport adaptedto receive a roller cutter 22. In this embodiment the roller cutter 22is a side cutter.

I'o assemble the bits the two pairs of forgings.

are placed together in a jig in proper relationship and are secured inthis position by welding at l9 and also at 23. The pin .portions 10 ofthe blade carrying segments are formed along their edges with grooves10a and cut-a-way portions lllb to receive the welding material shown at59, thus securing a bond between the segments it and I8 or 20 as thecase may be. Once the segments have been secured together, suitablethreads are: groundupon. the outer-periphery of the pin portions of theassembled bit and the bit isnthen readyrfonusein the conventionalmanner.

E'romiheforegoinggit will be seen that this invention is -one-welladapted to attain all of the ends andobjects hereinabove set forth,together with"other: advantages, which are obvious and which areinherent to'the structure.

ItLWill be understood that certain features and subcombinati'ons are'ofutility and may be employed'rwithoutreferenceto other features andsubcombinations; This-is contemplated by and is within the scope of theclaims.

Havingdescribedjmy invention, I claim:

19A .rotary drill bit comprising: two pairs of segments joined togetherand providing a bit with lahollow pinportion' and cutters, theindividu'a-l s'egments of :"each pair being: substantially identical'and"'being' arcuately shaped. with their longitudinaliedgesabutting toform a hollow pin, each ofthe segments of one pair. having -a portionmaking up a part of the pin of the bit and another portion-providingadrag-type bit blade providing acutter; one i of the segments of saidpair-also including ax lateral extension having a enclosedpassagecommunicating with the inte-rior of the'hollowpin for directing drillingfiuid upon-the blade-of said. last segment, the individual segme'nts :of'the-otherpair providing substantially the remainder'of'the pin.

2; A rotaryv drill. bitucom-prising two pairs of segments joinedtogethercand providing a-bit with a hollowrpinaportion and cutters,theindividual segments of each pair being substantially identicaland:beingarcuatelyshaped with their longitudinalgedgesq abutting to formthe hollow pin, each of the segments of one pair having a portionmaking; up a, part of the pin of the bit and another portion providing adrag-type bit blade providing a, cutter, one of the segments of saidpain also including a substantially fiat lateral extensionhavingaconcavity therein and an outer edge which, on assembly of the bit,overlies and cooperateswith asurface of the other segment of;saidapairwith said outer edge'abutting the blade? surface of-said othersegment to define an enclosed passage communicating with the interior ofthe hollow pin for directingdrilling fluid tially the remainder of thepin, and having a portion providing a support for a roller cutter, thecutter blade segments having a drillable portion for providing adrilling fluid passage communicating with the interior of the pin.

3. As a subcombination, a bit segment adapted to be made up into andprovide a component part of a drag-type bit and combination drag androller cutter bit, comprising an upper portion arcuate in cross-sectionand adapted to constitute a part of a bit pin, a cutter blade elementformed at the lower portion of the segment, a substantially flatextension on the exterior surfaceofthexsegment below the arcuate upperportion thereof, said extension having a concavity therein and an outeredge, whereby said extension is adapted to overlie and cooperate withthe surface of another identical segment with said outer edge abuttingthe blade surface of said other segment, on assembly, into a bit, toprovide anenclosed flush passage for directing drilling fiuiduponacutterblade of abit so formed, said cutter blade portion having an enlargementon and extending from the extension which has a flush passage thereinfor directing drilling fluid upon a roller cutter on assembly of thesegment as a part or" a combination drag and side cutter bit.

l; A rotary drill bit comprising, a pair of segments of identicalconstruction, each segment having its upper portion generally arcuate intransverse section and forminga part ofthe connecting pin of thecompleted bit and having its lower portion formed as adrag-type bitblade to provide a cutter, each segment also'having an inwardlyextending lateral extension which is 1 disposed between the arcuateupperportion and to overlie the blade surface of the othensegment thedrag-typeblade portion, with each of said lateral extensions having aconcavity therein and an outer edge, each extension being adapted withtheouter edge abutting said blade surface of the other-segment when thesegments are fitted together whereby the concavity of each lateralextension and the-blade surface whichit overlies form a fluid, passagetherebetween, a

pair of segmental sectionsarcuatein cross-section and adapted. to bepositioned between the arcuate upper: portions of the segmentsandcoactingtherewith to complete the annular connecting pin of the bit,and means for connecting thesegments and segmental sections to eachother.

5. A. rotary drill bit comprising, apair of segments of identicalconstruction, each, segment having its upper portion generally arcuatein transverse section andforming a part of the connecting pinof thecompleted bit and having its lower portion formed as a drag-type bitblade to provide a cutter, each segment also having a lateral extensionwhich, is directed inwardly along a plane which is parallel to a planetransversely of the bit and which is disposedbetween the arcuate upperportion and the drag-type blade portion, each lateral extension of onesegment havinga groove which is adapted to overlie thelateral extensionof the other segment and also being arranged to extend in overlappingrelation to the surface of the blade portionof the other segment, thelongitudinal edge portion of each extension engaging the surface of theblade portion which it overlies, whereby said lateral extensions providea reinforcement of the segments and a fluid passage between" eachlateral extension and the bladesurface of the other segment when saidsegments are fitted together, a pair of segmentalsections arcuate incross-section and adapted to be positioned between the arcuate upperportions of the segments and co-acting therewith to complete thecylindrical connecting pin of the bit, and means for connecting thesegments and segmental sections to each other.

6. A rotary drill bit as set forth in claim 4, together with adownwardly directed longitudinal extension of each of the segmentalsections, and a roller cutter supported in said extension.

7. A rotary drill bit as set forth in claim 5,

together with an enlargement on the outer surface of each lateralextension having a fluid passage therein, a longitudinal extension oneach REFERENCES CITED The following references are of record in the fileof this patent:

UNITED STATES PATENTS Number Name Date 1,080,575 Myers Dec. 9, 19131,428,137 v Brookhout et a1. Sept. 5, 1922 1,514,415 Arnot Nov. 4, 19241,644,142 Metzger et a1 Oct. 4, 1927 1,845,168 McHaley Feb. 16, 19321,869,969 Kennedye Aug. 2,1932 1,874,066 Scott et a1. Aug. 30, 19321,932,487 Scott Oct. 31, 1933 2,198,849 Waxler Apr. 30, 1940 2,297,157McClinton Sept. 2'9, 1942 2,321,484 Harrington et a1. June 8, 19432,380,112 Kinnear July 10, 1945 2,446,795 Trimble Aug. 10, 1948

